Uplink Signal Starting Position with LBT Timing Advance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling increased data traffic and spectrum demands, especially in scenarios requiring seamless mobility and high data rates, which are not adequately addressed by current technologies.
Innovation Solution
Implementing carrier aggregation and dual connectivity mechanisms, including timing advance groups, listen-before-talk procedures, and adaptive modulation schemes to optimize network efficiency and spectrum utilization, especially in licensed and unlicensed bands, while ensuring fair coexistence with other technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and dual connectivity are implemented to handle increased data traffic, then network capacity and data rates are enhanced, but device complexity and protocol management overhead increase
Solution Approach 1:
The patent segments the carrier aggregation mechanism by introducing separate timing advance groups (TAGs) for different carrier groups. Each TAG independently manages timing advance parameters, allowing the system to handle multiple carriers without overwhelming complexity. The segmentation of timing management into discrete groups enables scalable operation as the number of carriers increases.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting timing advance values and transmission power levels based on channel conditions and traffic requirements. The system modifies operational parameters in response to varying network conditions, enabling adaptive optimization of network capacity while managing complexity through automated parameter adjustment rather than manual configuration.
2Reliability
If timing advance groups are used to manage multiple carriers, then uplink timing synchronization is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the uplink timing management into separate timing advance groups, where each group handles timing synchronization for a specific subset of carriers. This segmentation allows the signal processing system to manage timing for multiple carriers through modular, independent processing units rather than a single complex processing system.
Solution Approach 2:
The patent implements preliminary action by pre-configuring timing advance parameters and establishing timing advance groups before actual data transmission begins. This preliminary setup reduces the complexity of real-time signal processing by having timing parameters already determined and stored, allowing the system to focus processing resources on actual data transmission rather than timing calculation during active communication.
3Adaptability or versatility
If listen-before-talk procedures are implemented in unlicensed bands, then fair coexistence with other technologies is ensured, but transmission latency increases
Solution Approach 1:
The patent applies periodic action by implementing listen-before-talk procedures with configured listening periods followed by transmission opportunities. The system uses periodic listening intervals to detect channel occupancy by other technologies, allowing fair coexistence while managing latency through predetermined listening schedules rather than continuous monitoring, thereby reducing unnecessary time loss.
Solution Approach 2:
The patent utilizes dynamics by making the listen-before-talk parameters adjustable and adaptive. The system can dynamically modify listening durations, transmission opportunities, and channel access parameters based on current network conditions and traffic patterns. This dynamic adjustment allows optimization of the balance between coexistence fairness and transmission latency for different operational scenarios.
Data Source
AI summary
Wireless communications are described. A wireless device may receive configuration parameters of an unlicensed cell. The configuration parameters may indicate a starting position in an uplink subframe. The starting position may be based on a listen-before-talk (LBT) period and a timing advance value.